Dtc B2789 No Response From Id Box

Power Source Network. Corolla. Zre142 Aze141
Networking. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ID CODE BOX)

CHECK HARNESS AND CONNECTOR (ID CODE BOX BATTERY VOLTAGE AND GROUND)

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

CHECK FOR DTC

DTC B2789 No Response from ID BOX


DESCRIPTION

This DTC is output when LIN communication between the certification ECU (smart key ECU assembly) and the ID code box (immobiliser code ECU) stops for more than 10 seconds.

DTC No.
DTC Detection Condition
Trouble Area
B2789
No communication between the certification ECU (smart key ECU assembly) and the ID code box (immobiliser code ECU) for more than 10 seconds
  1. ID code box (immobiliser code ECU)
  2. Certification ECU (smart key ECU assembly)
  3. Wire harness or connector

WIRING DIAGRAM


Corolla. Zre142 Aze141.Networking.Lin Communication System. Dtc B2789 No Response From Id Box


INSPECTION PROCEDURE

NOTICE:
  1. If the certification ECU (smart key ECU assembly) is replaced, register the keys and ECU communication ID (COROLLA_ZRE142 RM000000QYF05AX.html).
  2. If the ID code box (immobiliser code ECU) is replaced, register the ECU code and ECU communication ID (COROLLA_ZRE142 RM000000QYF05AX.html).
1.CLEAR DTC

  1. Clear the DTC (COROLLA_ZRE142 RM000002XHS04WX.html).


NEXT


2.CHECK FOR DTC

  1. Recheck for the DTC (COROLLA_ZRE142 RM000002XHS04WX.html).

    OK:
    B2789 is not output.


NG
Go to step 3
OK

USE SIMULATION METHOD TO CHECK (COROLLA_ZRE142 RM000000UZ108OX.html)

3.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ID CODE BOX)


    Corolla. Zre142 Aze141.Networking.Lin Communication System. Dtc B2789 No Response From Id Box

  1. Disconnect the E36 and E22 connectors.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E36-10 (LIN) - E22-3 (LIN1)
    		Always
    		Below 1 Ω
    E36-10 (LIN) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (ID CODE BOX BATTERY VOLTAGE AND GROUND)


    Corolla. Zre142 Aze141.Networking.Lin Communication System. Dtc B2789 No Response From Id Box

  1. Measure the resistance and voltage according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E22-8 (GND) - Body ground
    		Always
    		Below 1 Ω
    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E22-1 (+B) - Body ground
    		Always
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

  1. Replace the ID code box (immobiliser code ECU) (COROLLA_ZRE142 RM000003G05004X.html).


NEXT


6.CHECK FOR DTC

  1. Clear the DTC (COROLLA_ZRE142 RM000002XHS04WX.html).

  1. Recheck for the DTC.

    OK:
    B2789 is not output.


NG
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (COROLLA_ZRE142 RM000003G0O004X.html)
OK

END (ID CODE BOX (IMMOBILISER CODE ECU) IS DEFECTIVE)